Filament: Restaurant Menu Management

In this project, we have two Models:

• Category
  • name
  • position (for list ordering)
  • dishes (HasMany relationship)
• Dish
  • name
  • price (stored as cents)
  • position (for list ordering)
  • category (BelongsTo relationship)

Models

Here are the contents of both models with fields and relationships defined.

app/Models/Category.php

namespace App\Models;
 
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
 
class Category extends Model
{
    use HasFactory;
 
    protected $fillable = ['name', 'position'];
 
    public function dishes(): HasMany
    {
        return $this->hasMany(Dish::class);
    }
}

app/Models/Dish.php

namespace App\Models;
 
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
class Dish extends Model
{
    use HasFactory;
 
    protected $fillable = [
        'category_id',
        'name',
        'price',
        'position',
    ];
 
    public function category(): BelongsTo
    {
        return $this->belongsTo(Category::class);
    }
}

Category Resource And Nested Pages

First, we need a way to abstract this functionality to have nested resources. The main idea is for every child page to have a parent resource. For that reason, we implement this trait.

app/Filament/Traits/HasParentResource.php

namespace App\Filament\Traits;
 
use Exception;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\ModelNotFoundException;
 
trait HasParentResource
{
    public Model|int|string|null $parent = null;
 
    public function bootHasParentResource(): void
    {
        if ($parent = (request()->route('parent') ?? request()->input('parent'))) {
            $parentResource = $this->getParentResource();
 
            $this->parent = $parentResource::resolveRecordRouteBinding($parent);
 
            if (! $this->parent) {
                throw new ModelNotFoundException();
            }
        }
    }
 
    public function getParentResource(): string
    {
        if (! isset(static::$parentResource)) {
            throw new Exception('Parent resource is not set for ' . static::class);
        }
 
        return static::$parentResource;
    }
 
    protected function applyFiltersToTableQuery(Builder $query): Builder
    {
        return $query->where(str($this->parent?->getTable())->singular()->append('_id'), $this->parent->getKey());
    }
 
    public function ...